Consider the following table for a perlod of six years: a-1. Calculate the arithmetic average returns for large-company stocks and T-bills over this time period. Note: Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.9., 32.16. a-2. Calculate the standard deviation of the returns for large-company stocks and T-bitts over this time period. Note: Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.9. 32.16. Calculate the observed risk premium in each year for the largo-company stocks versus the T-bilis. b-1. What was the arithmetic average risk pecmium over this period? Note; A negative answer should be indlicasod by a minus sign. Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.9, 32.16. b-2. What was the standard deviation of the risk premium over this penod? Note: Do not round Intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.9., 32.16